Process for the manufacture of sensitized velvet paper for photographical uses



April 1, 193% D. FRIEDLANDER 1,752,665

PROCESS FOR THE MANUFACTURE OF SENSITIZED VELVET V PAPER FOR PHOTOGRAPHICAL USES Filed July 7, 1927 I Patented Apr. 1, 1930 UNITED STATES PATENT OFFICE DANIEL IRIEDLANDER, F BRUSSELS, BELGIUM, ASSIGNOB '10 MESSBB. A. IEUBSING AND E. J. GRATAMA, BOTH OF AMSTERDAM, NETHERLANDS raocass 101?. um xmumcruan or smrsrrizan VELVET rum roa rno'rocmmcu. usns Application filed July 7, 1927, Serial 1T0..204,152, and in Germany In], 7, 1828.

It has long been desired in the photographical industry, especially for portraits, to produce a paper with a dull surface giving the image a distinctly artistic character.

5 Salt paper without addition of gelatine, papers prepared with starch or the like and gelatine emulsion, Fresson paper, Biihler and Hochheimer papers and the like only half fulfill this object.

Therefore this invention has relation not to the sensitive coating but to its support. The velvet-like appearance must be obtained by the support. The paper must really possess a velvety surface, and not only the ap- 5 pearance. Trials have proved that it is not sufiicient to mix the coating with a vegetable or animal fibrous-dust, whereby said dust is embodied in the coating. A uniform distribution .of the sensitized dust-fibres on the support would be nearly impossible without an adhesive medium; however, when adding an adhesive medium, the manufactured paper loses its velvet-like character, since the sensitized coating no longer consists in loose fibres.

Also the adhesive medium has for result to make the image flat i. e. lacking in depth.

This invention contemplates sensitizin the ready made velvet paper. Adhesive me ium can then be dispensed with.

I am aware velvet papers have been known before, for instance as tapestries, drawing papers and the like. Same have been manufactured by spreading and fixing by an adhesive medium a vegetable or animal dust or the like substance upon a paper.

In the accompanying drawing, the single figure, which illustrates a top plan view of my improved paper with a portion broken away, the well sized paper 10 is laid over with an adhesive medium 11 hardly soluble in water and the surface is spread over with a' fibrous dust 12, such as fine white woolpowder. After complete drying, the excess of dust is brushed off with a so t brushand the thus prepared paper is then sensitized.

I claim:

The process of making sensitized velvet paper for photographic use consisting in coating a wellsized sheet of paper with an adhesive material that does not readily dis- DR. DANIEL FRIEDLANDER. 

